Awakened Hunger by Piper Fox

Dr. Alison Winters has a secret: She’s looking for a cure for vampiric blood madness.
After years of research, Alison is hopeful she might, at long last, have the answers that will save her high school friend from an eternity of blood madness. And the handsome, mysterious vampire who shows up at her door can’t just be there by coincidence.
The gorgeous woman isn’t what the vampire Laurent expected to find. She’s tempting, but he suspects things aren’t at all what they seem.
Barely able to keep his hands off her, Laurent knows Alison is his fated mate, and he’s determined to claim Alison as his own.
The only problem is she’s hiding the rogue vampire he was sent to destroy. If she can’t save her friend, the rogue will have to die, and that just might destroy their bond as well. All of Laurent’s hope hangs on Alison and her cure.